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“The suspension does not constitute disciplinary action by the Zoo. Whether or not disciplinary action is taken will depend upon the outcome of the investigation.”

Dudley Councillor and former council leader David Sparkes, who sits on the zoo’s Board of Trustees, said: “There is only one shareholder in the company that is Dudley Zoo and Castle and that is Dudley Council.

“I have kept that shareholder, in the form of the Leader of the Council, and the Chief Legal Officer, informed of the situation.” Dudley Council has a long-term lease on the freehold of the zoo site.

Mr Suddock’s career began in the engineering industry before he became Chief Executive of registered charity Dudley Zoological Gardens in 1993. He is also a former chairman of the Royal Wolverhampton NHS Trust.

Highly connected in the tourism sector, Mr Suddock has fostered links with the British and Irish Association of Zoos and Aquaria, the British Association of Leisure Parks, Piers and Attractions and the European Association of Zoos and Aquaria.

He has also been chairman of the Heart of England Attractions Group, a consortium of West Midlands leisure attractions.

In May 2013 he was awarded the Director of the Year in the not for profit category in the West Midlands’ Institute of Directors’ annual awards.

In an interview with the Guardian in 2007 Mr Suddock said of the time he took over as zoo chief executive in 1993: “It was crap. Crap. It was on the point of closure.”

In 2000, the magazine Holiday Which? voted it Britain’s worst zoo.

Mr Suddock told the newspaper at the time: “The vast majority of the population in this part of the world can’t afford to go to Asia, Africa, South America for holidays - they might do one, if they’re bloody lucky, but not all three.

“So we’ve got to show them what wonderful species the world holds, and reinforce the message that we mustn’t exploit them.”

In its last available accounts for 2013, parent group Dudley and West Midlands Zoological Society Ltd said: “In 2013 we exceeded budgeted visitor figures and achieved a dramatic increase on the previous year. We welcomed 264,029 total visitors in the year compared to 225,429 in 2012. This was an increase of 17 per cent, which is considerable growth.

“The Society achieved a surplus after depreciation of £468,267. It remains our strategy to utilise our surplus to improve and enhance the site, to maintain it as a quality visitor attraction.”

Recent restoration work at the zoo includes a £1.15 million project refurbishing four of the zoo’s historic Tecton buildings which date back to the 1930s. The Safari Shop, kiosk and Bear Ravine have also undergone renovation with the help of Heritage Lottery cash.